Chair-back adjusting device

Abstract

The invention relates to a chair-back adjusting device which comprises a tail seat, a fixing seat arranged at the tail seat and a control piece arranged between the tail seat and the fixing seat, the tail seat is provided with a lower supporting plate and an upper supporting plate, the fixing seat is provided with a connecting end arranged between the upper supporting plate and the lower supporting plate, the upper supporting plate, the lower supporting plate and the connecting end tightly hold so as to produce enough friction resistance for preventing the connecting end from freely moving between the upper supporting plate and the lower supporting plate; and the control piece is operated to interlock the fixing seat so as to lead the fixing seat to move oppositely to the tail seat. The invention realizes that the depth of the chair-back is adjusted by single-handle operation, and achieves the effect of assist to move the chair-back without a human body or additional labor power; meanwhile, the invention provides the safety chair-back adjusting device which can effectively prevent a user from being hurt.

Description

technical field [0001] The invention relates to a seat structure, in particular to a seat back adjusting device of the seat. Background technique [0002] See US Patent No. 7,264,312 for "Back rest adjusting mechanism" and Figure 6 and Figure 7 Schematic diagram of the traditional seat back adjustment structure. The aforementioned background technologies have a common feature, that is, the occupant pulls the L-shaped handle with his hand to link the two catch assemblies, so that the two catch assemblies leave the long groove-shaped non-slip on both sides of the rectangular main bracket. department. This moment, the main support that is slidably located in the fitting seat forms a free state, and the occupant must use the body (usually the back) to promote the seat back, allowing the main support to move toward the outside of the fitting seat to make the seat back rise. After the seat back is pushed to the desired position by the occupant's body, the occupant can let go ...

AI Technical Summary

Problems solved by technology

[0003] Therefore, when adjusting the depth of the seat back, the handle must be turned by the hand of the occupant, and at the same time the back of the body (or additional manpower) is used to control the depth of the seat back, and it is impossible to use one-handed operation to control the depth of the seat back. Achieve the effect of adjusting the depth of the chair back

[0004] In addition, there is a second problem. When the occupant turns the knob to let the back of the seat form a free state, when the occupant uses the back of the body to push the back of the seat, the occupant's spine has been injured.

Because the occupant uses his body to resist the weight of the seat back and other parts to achieve the effect of pushing the seat back, this is a design that is not conducive to human health.

Moreover, if the body of the occupant does not lean against the back of the seat, when the back of the seat is allowed to slide down in a free state, it is easy to cause the back of the seat to collide with the body of the occupant, which is also harmful to the health of the occupant.

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